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Calcium oxide-based ceramic core for casting titanium alloy and manufacturing method thereof

A technology for calcium oxide-based ceramic cores, applied in the field of calcium oxide-based ceramic cores and preparation of the calcium oxide-based ceramic cores, can solve the problems of difficult core removal and obstacles to wide application, and achieve low cost and reduced reactivity , Low firing shrinkage and the effect of linear expansion

Inactive Publication Date: 2012-07-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alumina-based ceramic cores are very difficult to remove, often resulting in a 40% reject rate
This is also the main reason that has hindered its wide application for a long time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The method for preparing the calcium oxide-based ceramic core for titanium alloy casting of the present invention is:

[0032] Step 1: Prepare raw materials, and make 100 kilograms of calcium oxide-based ceramic cores need 10 kilograms of zirconium dioxide (ZrO 2 ), 10 kg of yttrium oxide (Y 2 o 3 ), 0.05 kg of thorium oxide (ThO 2 ) and the calcium oxide (CaO) of the balance;

[0033] Step 2: make sieved raw materials, calcium oxide (CaO), zirconium dioxide (ZrO 2 ), yttrium oxide (Y 2 o 3 ) and thorium oxide (ThO 2 ) is carried out by ball milling and sub-sieving, and the undersieve is taken to obtain the sieved raw material; the particle size of the undersieve is ≤100 microns;

[0034] In the present invention, in the ball milling process of the ball mill, the grinding body is selected as a 10mm bearing steel ball and a 5mm bearing steel ball in diameter, and 5g of 10mm bearing steel balls and 2g of 5mm bearing steel required for ball milling 1g of sieved raw ...

Embodiment 2

[0043] The method for preparing the calcium oxide-based ceramic core for titanium alloy casting of the present invention is:

[0044] Step 1: Prepare raw materials, 3 kg of zirconia (ZrO 2 ), 2 kg of yttrium oxide (Y 2 o 3 ), 0.05 kg of thorium oxide (ThO 2 ) and the calcium oxide (CaO) of the balance;

[0045] Step 2: make sieved raw materials, calcium oxide (CaO), zirconium dioxide (ZrO 2 ), yttrium oxide (Y 2 o 3 ) and thorium oxide (ThO 2 ) is carried out by ball milling and sub-sieving, and the undersieve is taken to obtain the sieved raw material; the particle size of the undersieve is ≤100 microns;

[0046] In the present invention, in the ball milling process of the ball mill, the grinding body is selected as a 10mm bearing steel ball and a 5mm bearing steel ball in diameter, and 10g of 10mm bearing steel balls and 2g of 5mm bearing steel required for ball milling 1g of sieved raw material ball.

[0047] Step 3: Mix the sieved raw material and oleic acid evenl...

Embodiment 3

[0055] The method for preparing the calcium oxide-based ceramic core for titanium alloy casting of the present invention is:

[0056] Step 1: mix raw materials, make 100 kilograms of calcium oxide-based ceramic cores need 15 kilograms of zirconium dioxide (ZrO 2 ), 5 kg of yttrium oxide (Y 2 o 3 ), 0.1 kg of thorium oxide (ThO 2 ) and the calcium oxide (CaO) of the balance;

[0057] Step 2: make sieved raw materials, calcium oxide (CaO), zirconium dioxide (ZrO 2 ), yttrium oxide (Y 2 o 3 ) and thorium oxide (ThO 2 ) is carried out by ball milling and sub-sieving, and the undersieve is taken to obtain the sieved raw material; the particle size of the undersieve is ≤100 microns;

[0058] In the present invention, in the ball milling process of the ball mill, the grinding body is selected as a 10mm bearing steel ball and a 5mm bearing steel ball in diameter, and 5g of 10mm bearing steel balls and 5g of 5mm bearing steel required for ball milling 1g of sieved raw material ...

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Abstract

The invention discloses a calcium oxide-based ceramic core for casting titanium alloy and a manufacturing method of the calcium oxide-based ceramic core. The calcium oxide-based ceramic core comprises the following components by weight percent: 1.0-15.0% of zirconium dioxide, 0.5-10.0% of yttrium oxide, 0.05-0.1% of thorium oxide and the balance of calcium oxide, and the sum of the contents of the above the component is 100%. According to the ceramic core, the bending strength is 15-30Mpa at room temperature, the bending strength is 5-10Mpa at high temperature, the high-temperature deflection is 0.2-0.5%, the firing shrinkage ratio is 1-1.5%, and the porosity is 40-50%. Compared with the existing commercial alumina-based ceramic core and silicon oxide-based ceramic core, the calcium oxide-based ceramic core of the invention greatly reduces the reactivity with molten titanium, and has the advantages of high temperature resistance, easiness in core leach, low in cost and the like.

Description

technical field [0001] The present invention relates to a ceramic core, more particularly to a calcium oxide-based ceramic core suitable for titanium alloy casting, and a method for preparing the calcium oxide-based ceramic core. Background technique [0002] The demand for precision castings in modern industry is gradually increasing. At the same time, in order to improve the overall performance of the engine in the aviation industry, improving the cooling structure of the blades and improving the cooling efficiency of the blades have become the current goals pursued by turbine blade designers and manufacturers. The manufacture of ceramic cores Become one of the bottlenecks of turbine blade manufacturing technology, its performance and quality will directly affect the pass rate and cost of blade production. Due to the increasingly complex cooling structure of the blade, the wall thickness of the blade becomes thinner, and the double-wall structure is very different from the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/01C04B35/622
Inventor 周铁涛高鹏
Owner BEIHANG UNIV
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